What's LINQ for PHP?
LINQ (Language INtegrated Query) is a powerful technlogy first presented in Microsoft .NET Framework 3.5. It enables to query some resources directly from your code without dependency on one type of resources. LINQ for PHP is a PHP implementation of this technology in PHP language. If you want to easily query your own datasources, try to download this project.
LINQ for PHP doesn't have a stable release today, but the actual version 0.8.1 seems to be stable enough. It enables to you LINQ to Objects part of LINQ project.